When you use the mobile Internet, it sometimes happens that the 4g or 4g plus icon on the status bar to the left of the network signal strength, which appears when mobile data is turned on the. The same icon when watching a YouTube video, disappears on its own for a second, several times in a row, sometimes for several seconds. The problem is that when I'm on a video call on Viber, when the mobile data icon disappears, it stops my video and when it picks up after a second, the video continues normally. Also, when you watch a video on YouTube, when the icon disappears and appears below the video, it shows the text that the network is established. I've done a software repair via xperia companion, factory reset the phone, reset internet settings, reverted to factory APN in settings, swapped the SIM card, but the problem is still there. I think it started happening after the latest system update. The same situation as if you turned off and immediately turned on the mobile internet yourself. Is the problem something to do with the phone's software, hardware or the mobile operator itself? Does anyone know how this nonsense can be solved? Thank you